Rock-drill-oiling device



Aug. 31 1926; 1,598,589

w. A. SMITH ROCK DRILL OILING DEVICE Filed June 20 1925 N M INVENTOR. L mu (WAS 12% H15 ATTO EYS.

Patented Aug. 31, 1926."

UNITED STATES PATENT OFFICE.

WILLTAM A. SMITH, OF ATHENS, PENNSYLVANIA, ASSIGNOB, TO 'INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ROOK-DRILL-OIIiING DEVICE.

Application filed June 20, 1925. Serial No. 38,475.

This invention relates to .fluid actuated rock drills, but more particularly to an oiling device for rock drills of the hammer ty e.

6 sually rock drills of the hammer type are equipped with means for automatically lubricating the working parts of the machine. Various means have been devised for accomplishing this purpose such as for 10 instancethe pulsation of pressure fluid into and out of the reservoir whereby minute quantities of oil are carried into the internal working parts of the machine at each stroke of the piston. In this type of oiler, the

- l5 passages leading through the reservoir are necessarily of small cross sectional'area and in consequence are liable to become clogged by dirt or other foreign matter.

It is accordingly an object of this inven- 2 tion to prevent clogging of the oil passage leading from the oil reservoir.

Another object is to introduce oil to the working parts of the machine immediately after each period of operation. I

35 A further object is to connectthe oil reservoir with the pressure fluid supply for admitting pressure fluid into the reservoir while the drill is in operation and to enable the oil to be carried to the working parts of the machine by the expansion of the pressure fluid in the reservoir after the piston stops reciprocating.

Other objects will be in part obvious and in art pointed out hereinafter.

'Fhe invention consists of the combination of elements, features of construction and arrangement of parts having the general mode of operation substantially as hereinafter described and more particularly pointed out in 40 the appended clalms and illustrated in the accompanying drawings, in which- Figure 1 is a longitudinal view in section of a rock drill in which is embodied one form which the invention may assume in A practice, and

Figure 2 is a perspective view of a front cylinder washer constructed in accordance with the practice of the invention.

Referring to the drawing, the invention is shown embodied in a rock drill in which a cylinder A and a back head B are secured to each other by means of the usual side bolts (not shown). A hammer piston C is arranged to reciprocate within the cylinder and in this instance is provided with a smooth unbroken forward extension D for deliverin blows upon a drill steel E supported within the forward end-of the cylinder A. A back cylinder washer F forms a closure for the rearward end of the cylinder A. A front cylinder washer G which is preferably pressfitted into the front end of the cylinder is provided with a bore H to receive the piston extension D -and to co.-

chest through a connection S held in position by a screw threaded plug T. The admission of pressure fluid to the 'machine is controlled by a throttle valve U which communicates with the valve chamber P through a supply passage V. The admission of pressure fluid to the front and rear ends of the cylinder A is eflected through admission ports W and X respectively and the ressure fluid is exhausted from the cylinder through an exhaust port Y which commuiiicates with the atmosphere through a passage Z formed betweenthe cylinder A and the bottom plate L.

In accordance with the practice of the invention, the front cylinder washer G is provided with an external annular-chamber b to form an oil reservoir whereby oil may be supplied to the working parts of the machine. A pair of small annular external grooves c are formed near the ends of the washer G and communicate with the reservoir through passa es (1 and also communicate with the supp y passage V through a passage e and ports f. The oil is introduced into the reservoir 6 through an openin my which is normally sealed by a suitable filler plug k.

T In the operation of the device, whenever the throttle va1ve.U isopened to admit pressure fluid to the valve chamber P, a portion of the pressure fluid will pass through the passage e, the ports finto the grooves c and thence through the passages d into the reservoir b. The ressure fluid thus enterin the reservoir b wllltend to prevent the oil rom flowing into the passage e, but after each period of operation when the throttle valve U is closed, the pressure fluid confined within the reservoir 6 will tend to expand and force the succeeding period of operation.

This method of lubricating rock drills has been found to bevery eificient .in operation.

Its advantages reside in the fact thatit is economical, and that owing to the comparatively large'cross sectional area of the pas-.

sage leading from the reservoir, the danger of clogging of said passage is eliminated.

'Another desirable advantage is that this construction permits of close regulation of the oil supply with respect to the period of operation, depending of course to some extent, upon the nature of the rock being drilled. This, however, may readilybe determined by the operator after alittle. prac-' tice and the operator may at all times know approximately the amount of oil within. the

reservoir since the consumption of the oil is.

directly proportional to the number of times the drill is set in operation, since approximately an equal amount ofoil is carried from the reservoir after each'period of operation.. In this way, the possibility of the machine running dry is eliminated.

I claim 1. In an oiling device for rock drills, the combination of a cylinder, a reciprocatory hammer piston in the cylinder, a valve chest having a valve chamber and a main supply passage, a throttle valve in said chest, a front cylinder washer within the cylinder provided with an external annular chamber forming an oil reservoir, external annular grooves in the washer in communication with the annular chamber, a passage leading from the annular grooves to the main supply passage tov admit pressure fluid from the supply passage into the reservoir while the drill is in operation and to permit the fluid from the reservoir into the valve cham ber immediately after the throttle valve is closed;

2. In an oiling device for rock drills, the combination of a cylinder, a reciprocatory hammer piston in the cylinder, a valve chest having a valve chamber and a main supply passa e, a throttle valve in the chest, a front cylin er washer provided with an external annular chamber forming an oil reservoir, external annular grooves on the washer, passages providing communication between the annular chamber and the annular grooves, and a passage leading from the annular grooves to the supply passage to admit pressure fluid into the annular chamber during the operation of the drill to prevent oil from flowing from the annular chamber and to convey oil from said annular chamber to the valve chest after'the drill ceases to operate.

3. Inan oiling device for rock drills, the combination of a cylinder, a reciprocatory hammer piston in the cylinder, a valve chest having a valve chamber and a main supply passage, a distributing valve in the valve chamber, a throttle valve in the chest to con trol the supply passage, a front cylinder washer inthe cylinder having an external annular chamber forming an oil reservoir, external annular grooves near the ends of the front cylinder washer, passages providing communication between the annular chamber and the annular grooves, and a passage communicating at one end with the annular grooves and at its other end with the supply passage at a point between the throttle valve and the valve chamber for conveying pressure fluid into the annular hamber during the operation of the drill and for conveyin oil from the annular chamber into the valve chest immediately after the throttlevalve is closed.

In testimony whereof I have signed this specification. 

